Installed the Linux FTDI drivers from the FTDI website. Same issue.
Configured a USB to Serial Adapter to connect to the RS232 port of the DCU-3. Same issue.
Used the DCU-3 with QLog in Windoze for several hours. Functions flawlessly.
I'm leaning toward the DCU-3 just doesn't like Linux!
Small glitch. But this small glitch isn't going to tempt me to use the Windoze over Linux!
QLog is an amazing logging application!!
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WW4DX